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Head gasket with a leak between the rightmost and centre cylinders. A leak in the head gasket - often called a "blown head gasket" - can result in a leak of coolant, the combustion gasses, or both. Blue smoke from the exhaust suggests that excess oil is entering the combustion chambers (although there are other possible causes than a head ...
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Gaskets and shaft seals were intended to limit the leakage of oil, but they were usually not expected to entirely prevent it. The blow-by gases would diffuse through the oil and then leak through the seals and gaskets into the atmosphere, causing air pollution and odors. The first refinement in crankcase ventilation was the road draught tube.
Leak-down testing is a static test. Leak-down tests cylinder leakage paths. Leak-down primarily tests pistons and rings, seated valve sealing, and the head gasket. Leak-down will not show valve timing and movement problems, or piston movement related sealing problems. Any test should include both compression and leak-down.
A rocker cover gasket (valve cover gasket in the US and Canada) is used to seal the joint between the cover and engine head. Failure of the gasket can cause oil to leak from the engine. A head gasket is used to seal the joint between the head and the engine block.
These gaskets generally have a much higher level of quality control than sheet gaskets and generally can withstand much higher temperatures and pressures. The key downside is that a solid metal must be greatly compressed in order to become flush with the flange head and prevent leakage.
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First, the head bolts simply weren't numerous or strong enough for the diesel's high compression ratio, so they started blowing head gaskets. Second big problem: GM's cost-cutters decided not to fit a water separator. Unlike gasoline, diesel fuel is subject to water condensation – hence the need for a water separator.
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